1. Lines

2. straight lines / curved lines
Is it going straight?
rising
curved line
falling

3. straight lines / curved lines
rising
straight line
rising
falling
curved line
falling straight

4. straight lines / curved lines
What is this?
What is this?

5. concurrent straight lines
passing through the same point
Will these 3 lines pass through
the same point?
so they are concurrent lines

6. concurrent straight lines
Are these lines concurrent?
Which are concurrent now?
Which are concurrent now?

7. collinear points Are these points on the same straight line?
so they are collinear
so they are not collinear

8. collinear points Which are collinear among these? Which else?
Bottom 3?
bottom 3 are not collinear

9. parallel straight lines
went beyond top line
went below top line
touching both lines
these lines are parallel to each other
even now
they are not parallel to each other